Ratchet-drill.



P; ARMSTRONG. RATGHRT DRILL. APPLIoATI'oN FILED Nov.15. 1906.

914,012. Patented Mar. 2, 1909.

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UNITED STATES PATENT OFFICE.

PAUL ARMSTRONG, OF CHICAGO, ILLINOIS, ASSIG-NOR TO THE ARMSTRONGBROTHERS TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

RATCHETDRILL.

Specification of Letters Patent.

Application filed November 15, 1906.

To all 'whom it may concern.'

Be it known that I, PAUL ARMSTRONG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Ratchet-Drills, of which the following is a specification.

One of the objects of this invention is the production of a ratchet drill combining compactness of construction with a considerable range of feed.

Another object of the invention is the pro- Vvision of an improved means for reversing the direction of rotation of the tool held in the drill.

The invention also relates to the other improvements in ratchet drills hereinafter set forth.

In the accompanying drawings Figure 1 is a sidek elevation of a ratchet drill embodying the features of my invention, showing the bearing member in its most retracted position. Fig. 2 is a view, partly in section on substantially the plane of dotted line 2 2 of Fig. 3, showing the bearing member in substantially its most extended position. Fig. 3 is a sectional view on dotted line 3 3 of Fig. 2. Fig. 4 is an outer end view of the head of the pawl comprised in the operating mechanism. Fig. 5 is an end view of the stem of said pawl, the head being removed, and of the screwplug that closes the recess in which the pawl is seated.

The embodiment herein shown of my invention comprises a body portion 1 and an operating arm 2 preferably formed integral with said body portion. The body portion 1 has parallel plane upper and lower surfaces 3 and 4, respectively, and in said body portion is formed a cylindrical opening 5. In said opening i's rotatably seated the tool-holder comprising the members 6 and 10. The member 6 is provided with a taper socket 7 therein for the reception of the taper shank of any ordinary twist drill, tap or other similar tool. The tool-holding member 6 has an axial opening 8 therein, the walls of which have left-hand screw-threads formed therein, which are engaged by the externally screwthreaded portion 9 of a cap 10 of annular form. The tool-holding member 6 has an annular flange 11 adapted to contact the surface 4 of the body portion 1. The upper end of the tool-holding member 6 is substantially flush with the upper surface 3 of the body portion 1, and the cap 10 has an integral annular flange 12 adapted to overlie and contact said surface for retaining the tool-holding member 6 in place. A plurality of notches 13 are formed in the flange 12 of the cap 10, in order to permit of the application of a suitable spanner (not shown) for turning said cap upon its screw-threads.

The cap 10 has a vertical opening 14 extending therethrough, the walls of which are provided with right-hand screw-threads to receive the externally screw-threaded bearing member 15, said member having a conical bearing point 16 at its upper end intended, in use, to bear against some adjacent portion of the work. A plurality of openings 17 are formed in the bearing member 15, to permit of rotating said member by means of a suitable spanncr (not shown). Compaetness and long feed being highly desirable in a tool of this character, I have arranged the parts of this ratchet drill so that the bearing member 15 may be retracted into the body ofthe tool to the greatest practicable extent. An annular recess 18 extending from the uppcrportion of the tool-holding member 6 to a point near the lower ends thereof is adapted to rcceive the lower end of the bearing member 15, and in said bearing member is a chamber 19 which is entered by the central portion of the tool-holding member when the bearing member is screwed down as far as possible.

The tool-holding member 6 is adapted to be rotated with relation to the body portion 1 by means of a pawl 20 slidably and rotatably mounted in a recess 21 formed in said body portion, the point of said pawl engaging square teeth 22 upon the periphery of said tool-holding member. The outer end of the recess 21 is closed by a taper screw plug 23 having an opening 24 therein through which the stem 25 of the pawl 2O extends. A coiled spring 26 bearing at its ends against the screw plug 23 and the pawl 20 tends to hold said pawl in engagement with the teeth 22. A knurled head 27 is secured upon the outer end of the stem 25 by means of a pin 2S extending through said head and stem. Two square studs 29 formed upon the inner side of said head at diametrically opposite points are adapted to lie within similar notches 30 formed in opposite sides of the outer end of the screw plug 23. The studs 29 are of such length that when the stem 25 is drawn outwardly by the operator and rotated slightly to throw said studs out of register with the notches 30 the pawl 2O will be held out of engagement with the ratchet teeth 22, permitting the 'free rotation of the tool-holding member 6.

Assuming the bearing member 15 to be screwed down into the cap 10 and the tool holding member 6 as tar as possible, the operation is as follows: The drill ct is inserted into the socket 7 of the tool-holding member 6, and the bearing member 15 rotated by means of a spanner (not shown) until the conical bearing point 16 bears against a convenient iiXed point opposite to the hole to be drilled. The drill is then rotated by oscillating the arm 2, and said drill is fed by rotating the bearing member 15 at suitable intervals. When the hole has been completed the bearing member 15 is rotated to retract it into the cap 10 and the tool-holding member 6, when the drill a can be withdrawn from the hole. When it is desired to reverse the direction of rotation of the drill or tap the pawl 20 is given a half-rotation by turning the lnurled head 27. As will appear from an inspection of Fig. 3, said pawl is adapted to engage either side of the square teeth 22 on the periphery of the tool-holding member 6. The screw-plug 23. can be removed when desired by first driving the pin 28 out oi the head 27 and stein 25. YWhen the head 27 is removed a screw-driver may be inserted into the 'notches 30 Jfor rotating the screw plug 23.

It will be seen that this drill is eXceedingly compact and simple in construction. l

threaded bearing member 15 is rotated to feed the drill.

I claim as my invention:

1. In a ratchet drill, an actuating lever provided with an opening; a two-part tool holder therein comprising an exteriorlytoothed hollow member having an inwardly extending socket flange, the outer wall of which is spaced away from the inner wall of the said member, threads on the interior of said member, and a second member having an opening provided with exterior and interior threads, those on the exterior of the second member engaging the interior ones on the 'first member, .an eXteriorly-threaded bearing member whose threads engage the interior threads of the second member, said bearing member being adapted to have a portion of its wall lie between the socket iiange and the inner wall of the iirst mentioned member; and a pawl carried by the actuating lever to engage said toothed tool holder.

2. A ratchet drill comprising two parts, one threaded within the other and each having a peripheral flange, one of said parts having a socket flange spaced away Jfrom the wall of the part which supports it and a toothed exterior, one oi said parts being interiorly threaded to receive an eXteriorly threaded bearing member 'whose wall is adapted to pass between the socket ange and the wall of the flange-supporting part; an actuating lever provided with a body portion surrounding one of said members and conned between the iianges of both said parts; and a tooth-engaging pawl carried by the lever.

PAUL ARMSTRONG. Witnesses z L. L. MILLER, GEORGE L. CHINDAHL. 

